Sofa



FIG. 1 is a front perspective view of the sofa showing my design.

FIG. 2 is top plan view thereof;

FIG. 3 is a back view thereof; and,

FIG. 4 is a side view thereof.

The broken lines shown on the sofa are understood to represent stitching. The dotted lines shown of the foot element are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a sofa, as shown and described. 